C
C Copyright (C) by Argonne National Laboratory
C     See COPYRIGHT in top-level directory
C

        program main
        implicit none
        include 'mpif.h'
        integer ierr, errs
        logical flag
        integer value, commsize, commrank

        errs = 0
        call mpi_init( ierr )

        call mpi_comm_size( MPI_COMM_WORLD, commsize, ierr )
        call mpi_comm_rank( MPI_COMM_WORLD, commrank, ierr )

        call mpi_attr_get( MPI_COMM_WORLD, MPI_TAG_UB, value, flag, ierr
     $       ) 
        if (.not. flag) then
           errs = errs + 1
           print *, "Could not get TAG_UB"
        else
           if (value .lt. 32767) then
              errs = errs + 1
              print *, "Got too-small value (", value, ") for TAG_UB" 
           endif
        endif

        call mpi_attr_get( MPI_COMM_WORLD, MPI_HOST, value, flag, ierr )
        if (.not. flag) then
           errs = errs + 1
           print *, "Could not get HOST"
        else 
           if ((value .lt. 0 .or. value .ge. commsize) .and. value .ne.
     $          MPI_PROC_NULL) then 
              errs = errs + 1
              print *, "Got invalid value ", value, " for HOST"
           endif
        endif   

        call mpi_attr_get( MPI_COMM_WORLD, MPI_IO, value, flag, ierr )
        if (.not. flag) then
           errs = errs + 1
           print *, "Could not get IO"
        else
           if ((value .lt. 0 .or. value .ge. commsize) .and. value .ne.
     $          MPI_ANY_SOURCE .and. value .ne. MPI_PROC_NULL) then
              errs = errs + 1
              print *, "Got invalid value ", value, " for IO"
           endif
        endif

        call mpi_attr_get( MPI_COMM_WORLD, MPI_WTIME_IS_GLOBAL, value,
     $       flag, ierr )
        if (flag) then
C          Wtime need not be set
           if (value .lt.  0 .or. value .gt. 1) then 
              errs = errs + 1
              print *, "Invalid value for WTIME_IS_GLOBAL (got ", value,
     $             ")" 
           endif
        endif

        call mpi_attr_get( MPI_COMM_WORLD, MPI_APPNUM, value, flag, ierr
     $       )
C     appnum need not be set
        if (flag) then
           if (value .lt. 0) then
              errs = errs + 1
              print *, "MPI_APPNUM is defined as ", value,
     $             " but must be nonnegative" 
           endif
        endif

        call mpi_attr_get( MPI_COMM_WORLD, MPI_UNIVERSE_SIZE, value,
     $       flag, ierr )
C     MPI_UNIVERSE_SIZE need not be set
        if (flag) then
           if (value .lt. commsize) then
              errs = errs + 1
              print *, "MPI_UNIVERSE_SIZE = ", value,
     $             ", less than comm world (", commsize, ")"
           endif
        endif
    
        call mpi_attr_get( MPI_COMM_WORLD, MPI_LASTUSEDCODE, value, flag
     $       , ierr )
C Last used code must be defined and >= MPI_ERR_LASTCODE
        if (flag) then
           if (value .lt. MPI_ERR_LASTCODE) then
            errs = errs + 1
            print *, "MPI_LASTUSEDCODE points to an integer (",
     $           MPI_ERR_LASTCODE, ") smaller than MPI_ERR_LASTCODE (",
     $           value, ")"
            endif
         else 
            errs = errs + 1
            print *, "MPI_LASTUSECODE is not defined"
         endif

C     Check for errors
      if (errs .eq. 0) then
         print *, " No Errors"
      else
         print *, " Found ", errs, " errors"
      endif

      call MPI_Finalize( ierr )

      end
